UX: RepositoryListItem should truncate description

| Question | Response |
| ---------------- | ----------- |
| Version? | v1.4.1 |
| Devices tested? | iPhone 7 |

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## What Currently Happens?

If you search for the user "vhicxs", and check his repositories list, you will notice a weird 3 blank pages scrolling in the "vhcixs/repository"

This is because the repository description is a big HTML chunk: https://github.com/vhicxs/google

## What Do You Expect To Happen?

The HTML tags should be displayed, and the description should be truncated at some point. (GitHub limit seems to be 350 chars, we seems pretty fair)

## My Reproduction Steps

1. Open the application
1. Navigate to search
1. Click "Users"
1. Search for "vhcixs"
1. Click the search result corresponding to "vhcixs" to go to the user profile
1. Click on the repositories number

首先定位用户仓库列表中使用的 RepositoryListItem 组件，并使用 vhicxs 账户重现该问题。检查仓库描述的渲染方式，然后验证长 HTML 描述是否会被截断，并且不再创建空白滚动页面。

由索引模型根据 Issue 内容生成。